base class, extends NXobject
A neutron velocity selector
No symbol table
@default: (optional) NX_CHAR
Declares which child group contains a path leading to a NXdata group.
It is recommended (as of NIAC2014) to use this attribute to help define the path to the default dataset to be plotted. See https://www.nexusformat.org/2014_How_to_find_default_data.html for a summary of the discussion.
type: (optional) NX_CHAR
velocity selector type
velocity selector rotation speed
radius at beam centre
spoke width at beam centre
number of spokes/lamella
twist angle along axis
offset vertical angle
input beam height
input beam width
deviation FWHM /Wavelength
depends_on: (optional) NX_CHAR
NeXus positions components by applying a set of translations and rotations to apply to the component starting from 0, 0, 0. The order of these operations is critical and forms what NeXus calls a dependency chain. The depends_on field defines the path to the top most operation of the dependency chain or the string “.” if located in the origin. Usually these operations are stored in a NXtransformations group. But NeXus allows them to be stored anywhere.
geometry: (optional) NXgeometry
DEPRECATED: Use the field depends_on and NXtransformations to position the velocity selector and NXoff_geometry to describe its shape instead
OFF_GEOMETRY: (optional) NXoff_geometry
This group describes the shape of the beam line component
TRANSFORMATIONS: (optional) NXtransformations
This is the group recommended for holding the chain of translation and rotation operations necessary to position the component within the instrument. The dependency chain may however traverse similar groups in other component groups.
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.